# AD 70-09-01: Operation Of Battery Switch

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 737-100 Series, 737-200 Series, 737-200C Series, 737-300 Series, 737-400 Series, 737-500 Series, 737-600 Series, 737-700 Series and 737-800 Series
- Effective: April 23, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-976
- Registered aircraft: 823 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/42B9FCF5C526286A86256831006B7ACB.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-09-01

## The airworthiness directive

70-09-01 BOEING: Amdt. 39-976. Applies to Model 737 series airplanes.

Compliance required within the next 250 hours time in service after the effective date of this ad, unless already accomplished.

As a result of FAA evaluations of the 737 electrical system sufficient cause has been found to prevent inadvertent operation of the battery switch located on the forward overhead panel. Inadvertent operation of the battery switch during some operating conditions could result in loss of the standby electrical system. To prevent inadvertent operation of the battery switch on the forward overhead panel on the subject 737 series airplanes, accomplish one of the following:

  (1) Install a switch guard and light plate per the Boeing Service Bulletin No. 24- 1010 Revision (1) dated April 24, 1970, or later FAA approved revisions.

  (2) Replace the battery switch with a detent lock type switch, P/N MS 24659-23D or an equivalent MS type, provided the galley switch is a toggle type.

  (3) Perform an equivalent installation approved by the Chief, Aircraft Engineering Division, FAA, Western Region.

This amendment becomes effective April 23, 1970.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 9 of 17 models: 737-500 Series, 737-100 Series, 737-200C Series, 737-800 Series, 737-300 Series, 737-200 Series, 737-700 Series, 737-400 Series…

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 823 (823 by airframe model, 0 by engine model)
- Makers: Boeing 823

Models with the most aircraft:

- [Boeing 737-823](https://openairdocs.org/model/boeing-737-823): 278 aircraft (airframe model)
- [Boeing 737-800](https://openairdocs.org/model/boeing-737-800): 139 aircraft (airframe model)
- [Boeing 737-824](https://openairdocs.org/model/boeing-737-824): 135 aircraft (airframe model)
- [Boeing 737-832](https://openairdocs.org/model/boeing-737-832): 73 aircraft (airframe model)
- [Boeing 737-890](https://openairdocs.org/model/boeing-737-890): 60 aircraft (airframe model)
- [Boeing 737-724](https://openairdocs.org/model/boeing-737-724): 36 aircraft (airframe model)
- [Boeing 737-790](https://openairdocs.org/model/boeing-737-790): 14 aircraft (airframe model)
- [Boeing 737-752](https://openairdocs.org/model/boeing-737-752): 13 aircraft (airframe model)
- [Boeing 737-400](https://openairdocs.org/model/boeing-737-400): 8 aircraft (airframe model)
- [Boeing 737-852](https://openairdocs.org/model/boeing-737-852): 7 aircraft (airframe model)
- [Boeing 737-500](https://openairdocs.org/model/boeing-737-500): 6 aircraft (airframe model)
- [Boeing 737-436](https://openairdocs.org/model/boeing-737-436): 6 aircraft (airframe model)
- [Boeing 737-700](https://openairdocs.org/model/boeing-737-700): 5 aircraft (airframe model)
- [Boeing 737-300](https://openairdocs.org/model/boeing-737-300): 4 aircraft (airframe model)
- [Boeing 737-883](https://openairdocs.org/model/boeing-737-883): 4 aircraft (airframe model)
- [Boeing 737-205](https://openairdocs.org/model/boeing-737-205): 3 aircraft (airframe model)
- [Boeing 737-490](https://openairdocs.org/model/boeing-737-490): 3 aircraft (airframe model)
- [Boeing 737-484](https://openairdocs.org/model/boeing-737-484): 3 aircraft (airframe model)
- [Boeing 737-732](https://openairdocs.org/model/boeing-737-732): 3 aircraft (airframe model)
- [Boeing 737-524](https://openairdocs.org/model/boeing-737-524): 3 aircraft (airframe model)

All 40 models: https://openairdocs.org/ad/70-09-01/models.md
Every aircraft: https://openairdocs.org/ad/70-09-01/aircraft.md

Its text cites no advisory circulars or STCs.

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